Why new diseases keep appearing in China

On December 31, 2019, the Chinese government issued an alert to the World Health Organization about a new illness that was spreading through the city of Wuhan. Patients were coming down with a mysterious fever, dry cough, and pneumonia. Soon, some were dying. The source was a new virus, named SARS-CoV-2, and health officials were racing to find the source.

A leading hypothesis is that the virus emerged from animals at a popular market in Wuhan. This is not a surprise for many experts because it’s happened before. In 2003, a virus very similar to SARS-CoV-2 emerged from a market in Foshan, China. It caused the SARS disease, which spread to dozens of countries and killed nearly 800 people. As of March 6, SARS-CoV-2 has reached 83 countries and has killed more than 3,400 people, most of them in China.

The similarities between the two viruses raises the question: Why do new diseases keep emerging from China?

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